In addition, it can increase heat production by muscles and the brain.

The shell is both opened and closed by special muscles.

Muscle by muscle, she won control of her body back.

The primary requirement is a boat powered only by human muscle.

By her cold, waxen skin and rigid muscles, she had died many hours ago.

He was now suspending himself several feet off the ground, kept there by sheer muscle power and panic.

After an hour he began to move, muscle by muscle, toward the jar.

Muscle by muscle she allowed her body to melt against him.

Just the lines and angles covered by muscle and flesh.

In medical terms exertion is the expenditure of energy by skeletal muscles.